/***************************************************************************
 *   Copyright (c) 2004 Jürgen Riegel <juergen.riegel@web.de>              *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#ifndef GUI_BITMAPFACTORY_H
#define GUI_BITMAPFACTORY_H

#include <Base/Factory.h>
#include <QPixmap>

// forward declaration
class SoSFImage;
class QImage;

namespace Gui {

/** The Bitmap Factory
  * the main purpose is to collect all build in Bitmaps and
  * hold all paths for the extern bitmaps (files) to serve
  * as a single point of accessing bitmaps in FreeCAD
  * \author Werner Mayer, Jürgen Riegel
  */
class BitmapFactoryInstP;
class GuiExport BitmapFactoryInst : public Base::Factory
{
public:
    enum Position
    {
        TopLeft,  /**< Place to the top left corner */
        TopRight, /**< Place to the top right corner */
        BottomLeft, /**< Place to the bottom left corner */
        BottomRight /**< Place to the bottom right corner */
    };

    static BitmapFactoryInst& instance(void);
    static void destruct (void);

    void addCustomPath(const QString&);

    /// Adds a path where pixmaps can be found
    void addPath(const QString& path);
    /// Removes a path from the list of pixmap paths
    void removePath(const QString& path);
    /// Returns the absolute file names of icons found in the given search paths
    QStringList findIconFiles() const;
    /// Adds a build in XPM pixmap under a given name
    void addXPM(const char* name, const char** pXPM);
    /// Adds a build in XPM pixmap under a given name
    void addPixmapToCache(const char* name, const QPixmap& icon);
    /// Checks whether the pixmap is already registered.
    bool findPixmapInCache(const char* name, QPixmap& icon) const;
    /// Retrieves a pixmap by name
    QPixmap pixmap(const char* name) const;
    /** Retrieves a pixmap by name and size created by an
     * scalable vector graphics (SVG).
     */
    QPixmap pixmapFromSvg(const char* name, const QSize& size) const;
    /** This method is provided for convenience and does the same
     * as the method above except that it creates the pixmap from
     * a byte array.
     */
    QPixmap pixmapFromSvg(const QByteArray& contents, const QSize& size) const;
    /** Returns the names of all registered pixmaps.
    * To get the appropriate pixmaps call pixmap() for each name.
    */
    QStringList pixmapNames() const;
    /** Resizes the area of a pixmap
     * If the new size is greater than the old one the pixmap
     * will be placed in the center. The border area will be made
     * depending on \a bgmode transparent or opaque. 
     */
    QPixmap resize(int w, int h, const QPixmap& p, Qt::BGMode bgmode) const;
    /** Creates an opaque or transparent area in a pixmap
     * If the background mode is opaque then this method can
     * be used for drawing a smaller pixmap into pixmap \a p. 
     * Note: To draw a smaller pixmap into another one the
     * area in the resulting pixmap for the small pixmapmust 
     * be opaque in every pixel, otherwise the drawing may fail. 
     *
     * If the background mode is transparent then this method can
     * be used for resizing the pixmap \a p and make the new space
     * transparent.
     */
    QPixmap fillRect(int x, int y, int w, int h, const QPixmap& p, Qt::BGMode) const;
    /** Merges the two pixmaps  \a p1 and \a p2 to one pixmap in
     * vertical order if \a vertical is true, in horizontal order 
     * otherwise. The method resizes the resulting pixmap.
     */
    QPixmap merge(const QPixmap& p1, const QPixmap& p2, bool vertical) const;
    /** Merges the two pixmaps  \a p1 and \a p2 to one pixmap.
     * The position of the smaller pimxap \a p2 is drawn into the given
     * position \a pos of the bigger pixmap \a p1. This method does not
     * resize the resulting pixmap.
     */
    QPixmap merge(const QPixmap& p1, const QPixmap& p2, Position pos = BitmapFactoryInst::BottomLeft) const;
    /** Creates a disabled pixmap of the given pixmap \a p by changing the brightness 
     * of all opaque pixels to a higher value.
     */
    QPixmap disabled(const QPixmap& p) const;
    /** Converts a QImage into a SoSFImage to use it inside a SoImage node.
     */
    void convert(const QImage& img, SoSFImage& out) const;
    /** Converts a SoSFImage into a QImage.
     */
    void convert(const SoSFImage& img, QImage& out) const;

private:
    bool loadPixmap(const QString& path, QPixmap&) const;
    void restoreCustomPaths();

    static BitmapFactoryInst* _pcSingleton;
    BitmapFactoryInst();
    ~BitmapFactoryInst();

    BitmapFactoryInstP* d;
};

/// Get the global instance
inline BitmapFactoryInst& BitmapFactory(void)
{
    return BitmapFactoryInst::instance();
}

} // namespace Gui

#endif // GUI_BITMAPFACTORY_H
